1.登陆mysql:mysql -u root -p
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.01 sec)

mysql> use mysql;   # 切换到mysql数据库
  Reading table information for completion of table and column names
  You can turn off this feature to get a quicker startup with -A
  
  Database changed
mysql> select host,user from user;  # 查询user表
  +-----------+---------------+
  | host      | user          |
  +-----------+---------------+
  | %         | root          |
  | localhost | mysql.session |
  | localhost | mysql.sys     |
  +-----------+---------------+
  5 rows in set (0.00 sec)

 如果上述查询结果,root用户对应的host不为%,则修改用户权限


mysql> GRANT ALL PRIVILEGES ON *.* TO \'root\'@\'%\' IDENTIFIED BY \'root密码\' WITH GRANT OPTION;   # 修改权限
  Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> FLUSH PRIVILEGES;
  Query OK, 0 rows affected (0.00 sec)
 
或创建用户
mysql>insert into user (host,user,password) values(\'122.114.155.163\',\'admin\',password(\'ygpassword\'));

mysql>FLUSH PRIVILEGES;

mysql>GRANT ALL PRIVILEGES ON *.* TO \'admin\'@\'122.114.155.163\'IDENTIFIED BY \'ygpassword\' WITH GRANT OPTION;
mysql>FLUSH PRIVILEGES;

 完成。(如果连接不成功,继续执行下面操作)




2.阿里云的ECS需要手动添加安全组规则

 

 3.关闭防火墙(关闭防火墙,就可以外部访问了。不受端口限制。生产环境,最好开启防火墙,开启部分端口。)

1.永久有效

1 开启: chkconfig iptables on 
2 关闭: chkconfig iptables off

 

2.即刻生效

1 开启: service iptables start 
2 关闭: service iptables stop 

 

3.开启部分端口

1 vim /etc/sysconfig/iptables

添加想要开启的相关端口

1 -A INPUT -m state --state NEW -m tcp -p tcp --dport 6379 -j ACCEPT
2 -A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
3 -A INPUT -m state --state NEW -m tcp -p tcp --dport 8081 -j ACCEPT
4 -A INPUT -m state --state NEW -m tcp -p tcp --dport 8082 -j ACCEPT
5 -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

4.重启防火墙服务

1 service iptables restart 

 

方法4:(腾讯云)
配置腾讯云服务器的安全组开放3306端口
 
 

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